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18.An object moves along x -axis such th...

18.An object moves along `x` -axis such that its position varying with time `t` is given as `x=4t-t^(2)(x` is in metre and time `t` in second `)`.The distance travelled by the object from `t=0` to `t=3s` is
(1) `3m`
(2) `5m`
(3) `12m`
(4) `21m`

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